Enniskillen WWTW Outfall


ABCO Marine Ltd were contracted by Lagan Construction Ltd as specialist marine subcontractor on Enniskillen WWTW Outfall for NI Water. The project involved the preparation and installation of a 1000mm OD HDPE Outfall pipe from a shore 100lin/m to a lvel resting on the lakebed 3m below highest recorded water level.

ABCO Marine Ltd mobilised a Modular Spud Barge along with a Long Reach Excavator in support of pipe installation and lakebed excavation operations. The Modular Spud Barge was mobilised on the River Erne, Enniskillen. The pipe length was prepared on site and sunk to rest on the lake bed with concrete mattress place around to provide additional ballast and protection. This was supported by a Works Tug and Transfer Barge which was used to transport the materials to the works site to enable placement by commercial divers. 

Project Information

1000mm Outside Diameter Pipe and associated fittings 100lin/m on shore to discharge point, with the pipe length placed directly on the prepared lakebed trench using the ‘float and sink’ method of pipe installation.

ABCO sourced and procured the all materials utilised in the project, pipe lengths with associated fittings, concrete collars/mattress. With materials having to be taken across by materials transfer barge to support the pipe installation.

Mobilised Modular Spud Barge carrying a Long Reach Excavator, The Noo – Pushy Tug, Transfer Barge and Crew Transfer Vessels to support the outfall installation.

Pipe lengths prepared and welded on River Erne, Enniskillen. With all weld logs and testing conducted on site with quality documentation prepared and maintained.

Precast concrete collars were also attached at this location, before the prepared length was towed 2 nautical miles to the works site by The Noo Tug.

Pipe protection incorporated concrete mattress placed over the entire length of the pipe length and diffuser section.

Hydrographic surveys of the existing lakebed were completed, hydrographic survey were also utilised during the project, both pre/post sink surveys of the prepared trench.

ABCO Divers Ltd – commercial diving company, supported the installation of concrete mattress. With diving operations in water depth of 3m deep, with dive spread mounted on Modular Spud Barge for construction processes.


Lagan Construction for NI Water


August 2008 – September 2008

Client Representatives

Lagan Construction Ltd


Long Sea Outfalls

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